EP1571059B1 - Eine Kugel umfassende Zentriervorrichtung für einen pneumatischen Bremskraftverstärker - Google Patents

Eine Kugel umfassende Zentriervorrichtung für einen pneumatischen Bremskraftverstärker Download PDF

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Publication number
EP1571059B1
EP1571059B1 EP05003849A EP05003849A EP1571059B1 EP 1571059 B1 EP1571059 B1 EP 1571059B1 EP 05003849 A EP05003849 A EP 05003849A EP 05003849 A EP05003849 A EP 05003849A EP 1571059 B1 EP1571059 B1 EP 1571059B1
Authority
EP
European Patent Office
Prior art keywords
push rod
axial
centering
piston
rounded shape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP05003849A
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English (en)
French (fr)
Other versions
EP1571059A1 (de
Inventor
Jean-Marc Kientz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PL05003849T priority Critical patent/PL1571059T3/pl
Publication of EP1571059A1 publication Critical patent/EP1571059A1/de
Application granted granted Critical
Publication of EP1571059B1 publication Critical patent/EP1571059B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/18—Connection thereof to initiating means

Definitions

  • the invention relates to an axial force centering device applicable in particular to the transmission of forces provided by a brake booster servomotor to the master cylinder of the braking circuit, known for example from US-A-5,761,983.
  • brake servos and associated master cylinders are built in large series and, for this reason are subject to very delicate compromises in terms of cost and manufacturing accuracy. This leads in particular to significant difficulties in obtaining a perfect alignment of the push rod with the control rod, without which deformations under stress, followed by irreversible damage to the booster can occur.
  • the invention provides a solution to overcome both the fact that the axes of the push rod and the piston of the master cylinder are not collinear and because they are not strictly parallel.
  • a rounded element located between said hydraulic piston and the push rod. At least one of said front end of the push rod or said rear end of the hydraulic piston has a plane surface perpendicular to the first axial direction or the second axial direction and which is in contact with the rounded element. .
  • the rounded element is advantageously spherical.
  • said rounded element is the front end of the push rod, or said rounded element is the rear end of the hydraulic piston.
  • said rounded member is trapped in the rear end of the hydraulic piston or is attached to the forward end of the push rod.
  • the rear end of the hydraulic piston comprises a centering device arranged in the second axial direction and in which is placed the rounded element.
  • the front end of the push rod comprises a device for centering arranged in the first axial direction and in which is placed the rounded element.
  • this centering device of the rounded element comprises a bowl formed at the rear end of the hydraulic piston or at the front end of the push rod.
  • This bowl may have a general conical shape, spherical or paraboloid.
  • the rounded element and the planar end of the push rod or the hydraulic piston are made of materials of comparable hardness.
  • the rounded element is embedded in a lubricant or coated with a lubricant.
  • a servomotor 1 (located on the right in FIG. 1) comprises a rigid envelope 3 separated into two chambers 3a and 3b, in a sealed manner, by a membrane 4 integral with a pneumatic piston 5 movable inside the envelope 3 .
  • the front chamber 3a is sealed on the left side by the master cylinder 2. This chamber 3a is permanently connected to a vacuum source (not shown) by a connector 6.
  • the pressure in the rear chamber 3b is controlled by a valve 7, controlled by a control rod 8, which is connected to the brake pedal.
  • valve 7 When the control rod 8 is in the rest position, in this case pulled to the right, the valve 7 establishes a communication between the two chambers 3a and 3b of the booster.
  • the rear chamber 3b is then subjected to the same depression as the front chamber 3a, the piston 5 is pushed to the right, in the rest position, by a spring 9.
  • the actuation of the control rod 8 to the left has the effect, initially, of moving the valve 7 so that it isolates from each other the chambers 3a and 3b and, in a second time , to move this valve so that it opens the rear chamber 3b at atmospheric pressure.
  • the braking force exerted through the intermediary of a plunger 10, the control rod for the master cylinder, and the braking assistance force resulting from the thrust of the piston 5, are applied to the front (right) 11a of a reaction disc 11 housed in a cup 12 adapted to retransmit these forces to a push rod 13, which has the function of actuating a hydraulic piston 14 of the master cylinder.
  • the invention essentially relates to the force transmission chain that together constitute, in Figure 1, the control rod 8, the plunger 10, the piston 5, the reaction disc 11, the cup 12, the push rod 13 and the hydraulic piston 14.
  • Figure 1 shows a first embodiment of the system of the invention.
  • the piston 5 presses on the reaction disk 11 by an axial annular surface 5a which surrounds the probe 10.
  • the cup 12 is substantially cylindrical in shape and has a flat bottom 12a, perpendicular to the longitudinal axis YY 'of the control rod , and over the entire inner face of which the reaction disk 11 is supported.
  • the push rod 13 has a first end 13b secured to the flat bottom 12a of the cup 12, and holding means are provided on the master cylinder 2 to ensure that this push rod 13 remains substantially collinear with the control rod 8.
  • the thrust rod 13 acts via a rounded element on the piston 14 of the master cylinder.
  • this element is represented in the form of a spherical element 20.
  • the piston or an intermediate piece 14 integral with the piston has, at its end 14b, which is turned towards the push rod 13, a bowl whose axis is located along the axis XX 'of the piston.
  • the spherical element 20 is placed in this bowl and the push rod comes to press its flat end 13a against this spherical element.
  • the end 14b is extended by a hollow cylindrical piece 18 making it easier to place the spherical element 20 against the bowl 21. This piece 18 can form a single piece with the piece 14.
  • FIG. 2a represents an enlarged view of an exemplary embodiment of this force transmission device.
  • the intermediate piece 14 is mounted, for example screwed on the end 15b of the piston rod 15 which extends to the left (in the figure) to the piston of the master cylinder not shown.
  • the piece 14 is, for example, cylindrical and its axis is collinear with that of the piston rod 15. It should be noted that the piece 14 may be the piston of the master cylinder itself.
  • the end 14b of the intermediate piece 14 has the bowl 21 having a symmetry of revolution about the axis XX '.
  • this bowl 21 has a rounded hollow shape whose opening is sufficient relative to the diameter of the spherical element 20, and the hollow is sufficient for the spherical element to be positioned naturally along the axis XX 'when the thrust rod 13 exerts a force FS from the left to the right.
  • the push rod 13 is positioned in Figure 2a along an axis YY 'parallel to the axis XX' but offset with respect to this axis XX '.
  • the end face 13a of the push rod 13 is flat and perpendicular to the axis YY '.
  • the spherical element is made of a material of great hardness, greater than the hardness of the piston rod. This is, for example, a ball, as found in commerce, whose surface has been hardened.
  • the push rod 13 is made of material of hardness comparable to that of the spherical element so that the surface 13b of the push rod 13 is not marked by the shape of the spherical element under the effect of the transmitted forces by the push rod.
  • the spherical element 20 and the surface 13a of the push rod 13 have good surface qualities so that the surface 13a can slide easily on the spherical element.
  • Figure 2b shows an alternative embodiment of Figure 2a.
  • the bowl 21 has a conical shape whose axis of revolution is located along the axis XX '.
  • the angle at the apex of the cone is sufficiently open (large enough) for the spherical element to be placed naturally along the axis XX 'when it exerts a force such as FS with the push rod 13.
  • the bowl could have any other shape, without departing from the scope of the invention, provided to allow the spherical element to be placed along the axis XX '.
  • the bowl has a shape such that it allows the spherical element to rotate freely on itself under the effect of a friction of the face 13a when the push rod 13, offset with respect to the axis XX 'presses on the spherical element.
  • the piston of the master cylinder (or an intermediate piece integral with the master cylinder) 14 has an end 14b having a rounded shape. This end 14b then takes the place of rounded element 20.
  • the end 13a of the push rod 13 is a flat surface perpendicular to the axis YY 'of the push rod.
  • the rounded surface 20 is in contact with the flat end 13a of the push rod 13 and can slide on it, thereby retransmitting the forces of the push rod to the piston of the master cylinder without risk of deterioration of that or the servomotor even if the axes XX 'and YY' are not collinear.
  • FIG. 3b represents a variant in which the end 13a of the push rod is of rounded shape and therefore acts as a rounded element 20.
  • the end 14b of the part 14 (piston) is a flat surface perpendicular to the XX 'axis.
  • the rounded element 20 is in contact with the plane surface 14b and can slide thereon.
  • a rounded element 20 is trapped in the end 14b of the part 14.
  • the part 14 (piston for example) is advantageously molded and is for example plastic material.
  • the surface 13a of the push rod 13 is flat and perpendicular to the axis YY '.
  • FIG. 3d provides that the rounded element is fastened (for example by crimping) to the end 13a of the thrust rod 13.
  • the end 14b of the component 14 is a flat surface perpendicular to the axis XX '.
  • FIG. 4 represents a variant embodiment in which the push rod is secured, by its end 13b, to a cup 12 which is mounted on the piston 5 so as to center the rod of thrust along the axis YY '.
  • This cup is nested by force or screwed on the piston 5. The position of the push rod is thus determined by the mounting of the cup 12 on the piston.
  • the other end 13a of the push rod 13 is free. It passes through an input protection plate 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
  • Actuator (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Braking Arrangements (AREA)

Claims (10)

  1. Vorrichtung zur axialen Kraftzentrierung für eine Baugruppe, die aus einem pneumatischen Servomotor zur Bremsunterstützung (1) und einem Hauptzylinder (2) besteht, mit:
    • einer Steuerstange (8), die ausgehend von einer Ruheposition unter der Wirkung einer Eingangskraft einer Verlagerung entlang einer ersten axialen Richtung (YY') ausgesetzt sein kann, wobei diese Stange in einem Taster (10) endet;
    • einem pneumatischen Kolben (5), der ausgehend von einer Ruheposition unter der Wirkung eines durch die axiale Verlagerung der Steuerstange gesteuerten Druckunterschieds entlang dieser axialen Richtung (YY') beweglich ist;
    • einer Schubstange (13), die im Wesentlichen entlang der ersten axialen Richtung (YY') orientiert ist, wobei ein hinteres Ende (13b) dieser Schubstange die Kräfte am Ausgang des Kolbens (5) des Servomotors (1) aufnimmt und ein vorderes Ende (13a) diese Kräfte wiederum auf ein hinteres Ende (14b) eines hydraulischen Kolbens (14) des Hauptzylinders (2) überträgt, wobei der hydraulische Kolben (14) entlang einer zweiten axialen Richtung (XX') orientiert ist, welche zur ersten axialen Richtung kolinear ist oder nicht;
    dadurch gekennzeichnet, dass sie ein Element (20) mit einer abgerundeten Form aufweist, das zwischen dem hydraulischen Kolben (14) und der Schubstange (13) angeordnet ist, wobei das vordere Ende (13a) der Schubstange und/oder das hintere Ende (14b) des hydraulischen Kolbens (14) eine ebene Fläche aufweist, die zur ersten axialen Richtung (YY') bzw. zur zweiten axiale Richtung (XX') senkrecht verläuft und mit dem Element mit der abgerundeten Form in Kontakt ist.
  2. Vorrichtung zur axialen Kraftzentrierung nach Anspruch 1, dadurch gekennzeichnet, dass das Element (20) mit der abgerundeten Form kugelförmig ist.
  3. Vorrichtung zur axialen Kraftzentrierung nach Anspruch 1, dadurch gekennzeichnet, dass das Element (20) mit der abgerundeten Form das vordere Ende (13a) der Schubstange (13) ist, oder das Element mit der abgerundeten Form ist das hintere Ende (14b) des hydraulischen Kolbens (14).
  4. Vorrichtung zur axialen Kraftzentrierung nach Anspruch 2, dadurch gekennzeichnet, dass das Element (20) mit der abgerundeten Form im hinteren Ende (14b) des hydraulischen Kolbens (14) eingeschlossen oder am vorderen Ende (13a) der Schubstange (13) befestigt ist.
  5. Vorrichtung zur axialen Kraftzentrierung nach Anspruch 2, dadurch gekennzeichnet, dass das hintere Ende (14b) des hydraulischen Kolbens (14) eine Zentrierungsvorrichtung (21) aufweist, die entlang der zweiten axialen Richtung (YY') angeordnet ist und in die das Element (20) mit der abgerundeten Form eingesetzt ist.
  6. Vorrichtung zur axialen Kraftzentrierung nach Anspruch 2, dadurch gekennzeichnet, dass das vordere Ende (13a) der Schubstange (13) eine Zentrierungsvorrichtung (21) aufweist, die entlang der ersten axialen Richtung (XX') angeordnet ist und in die das Element (20) mit der abgerundeten Form eingesetzt ist.
  7. Vorrichtung zur axialen Kraftzentrierung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Vorrichtung zur Zentrierung des Elements (20) mit der abgerundeten Form eine Schale (21) aufweist, die am hinteren Ende (14b) des hydraulischen Kolbens (14) oder am vorderen Ende (13a) der Schubstange (13) ausgebildet ist.
  8. Vorrichtung zur axialen Kraftzentrierung nach Anspruch 7, dadurch gekennzeichnet, dass die Schale (21) eine insgesamt konische, kugelige oder paraboloidische Form aufweist.
  9. Vorrichtung zur axialen Kraftzentrierung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Element (20) mit der abgerundeten Form und das Ende mit der ebenen Form der Schubstange oder des hydraulischen Kolbens (14) aus Materialien mit vergleichbaren Härten bestehen.
  10. Vorrichtung zur axialen Kraftzentrierung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Element (20) mit der abgerundeten Form in ein Schmiermittel getaucht oder mit einem Schmiermittel bestrichen ist.
EP05003849A 2004-03-02 2005-02-23 Eine Kugel umfassende Zentriervorrichtung für einen pneumatischen Bremskraftverstärker Expired - Lifetime EP1571059B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05003849T PL1571059T3 (pl) 2004-03-02 2005-02-23 Urządzenie do osiowego środkowania w siłowniku pneumatycznym wspomagającym hamowanie zawierające element kulisty

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0402233A FR2867136B1 (fr) 2004-03-02 2004-03-02 Transmission d'effort par bille
FR0402233 2004-03-02

Publications (2)

Publication Number Publication Date
EP1571059A1 EP1571059A1 (de) 2005-09-07
EP1571059B1 true EP1571059B1 (de) 2006-11-02

Family

ID=34746489

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Application Number Title Priority Date Filing Date
EP05003849A Expired - Lifetime EP1571059B1 (de) 2004-03-02 2005-02-23 Eine Kugel umfassende Zentriervorrichtung für einen pneumatischen Bremskraftverstärker

Country Status (7)

Country Link
EP (1) EP1571059B1 (de)
AT (1) ATE344170T1 (de)
DE (1) DE602005000214T2 (de)
ES (1) ES2271919T3 (de)
FR (1) FR2867136B1 (de)
PL (1) PL1571059T3 (de)
PT (1) PT1571059E (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200035532A (ko) * 2018-09-27 2020-04-06 현대모비스 주식회사 브레이크 부스터

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2900620B1 (fr) * 2006-05-03 2008-08-08 Peugeot Citroen Automobiles Sa Servomoteur d'assistance au freinage pour un vehicule automobile

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975775A (en) * 1956-06-13 1961-03-21 Ford Motor Co Ball tipped push rod
US3983703A (en) * 1975-10-03 1976-10-05 General Motors Corporation Master cylinder push rod retention
JPH0958455A (ja) * 1995-08-25 1997-03-04 Jidosha Kiki Co Ltd 倍力装置の出力軸

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200035532A (ko) * 2018-09-27 2020-04-06 현대모비스 주식회사 브레이크 부스터

Also Published As

Publication number Publication date
ATE344170T1 (de) 2006-11-15
DE602005000214D1 (de) 2006-12-14
DE602005000214T2 (de) 2007-05-31
FR2867136A1 (fr) 2005-09-09
PL1571059T3 (pl) 2007-03-30
EP1571059A1 (de) 2005-09-07
FR2867136B1 (fr) 2006-05-12
PT1571059E (pt) 2007-01-31
ES2271919T3 (es) 2007-04-16

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